Home / 12,143.88-18,215.85-3,378.80

Finding the Fourth Proportional to 12,143.88, 18,215.85 and 3,378.80

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Solution

The fourth proportional to 12,143.88, 18,215.85 and 3,378.80 is: 5,068.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,143.88 : 18,215.85 = 3,378.80 : x
  2. Step 2: Convert to fraction form
    12,143.88/18,215.85 = 3,378.80/x
  3. Step 3: Cross multiply
    12,143.88x = 18,215.85 × 3,378.80
  4. Step 4: Simplify right side
    12,143.88x = 61,547,713.98
  5. Step 5: Solve for x
    x = 61,547,713.98/12,143.88
  6. Step 6: Final answer
    x = 5,068.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.